retrogression
noun
                                                                                                                            
                                                            ret·ro·gres·sion
                    
                                                                                                              
                                                                                                                                  ˌre-trə-ˈgre-shən  
                                                      
                                                          
            2
                    
                                          
              
          
                                                      : return to a former and less complex level of development or organization                                      
                
                    
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  Merriam-Webster unabridged




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